diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index f5fa70494a7..43fb87f203f 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,13 +1,3 @@
-*   Take DST into account when locating TimeZone from Numeric.
-
-    When given a specific offset, use the first result found where the
-    total current offset (including any periodic deviations such as DST)
-    from UTC is equal.
-
-    Fixes #15209.
-
-    *Yasyf Mohamedali*
-
 *   Added `#without` on `Enumerable` and `Array` to return a copy of an
     enumerable without the specified elements.
 
diff --git a/activesupport/lib/active_support/values/time_zone.rb b/activesupport/lib/active_support/values/time_zone.rb
index ab6a78052c3..da39f0d2450 100644
--- a/activesupport/lib/active_support/values/time_zone.rb
+++ b/activesupport/lib/active_support/values/time_zone.rb
@@ -239,7 +239,7 @@ module ActiveSupport
           end
           when Numeric, ActiveSupport::Duration
             arg *= 3600 if arg.abs <= 13
-            all.find { |z| z.utc_total_offset == arg.to_i }
+            all.find { |z| z.utc_offset == arg.to_i }
           else
             raise ArgumentError, "invalid argument to TimeZone[]: #{arg.inspect}"
         end
@@ -285,12 +285,6 @@ module ActiveSupport
       end
     end
 
-    # Returns the offset of this time zone from UTC in seconds,
-    # taking DST into account.
-    def utc_total_offset
-      tzinfo.current_period.utc_total_offset if tzinfo
-    end
-
     # Returns the offset of this time zone as a formatted string, of the
     # format "+HH:MM".
     def formatted_offset(colon=true, alternate_utc_string = nil)
diff --git a/activesupport/test/core_ext/time_with_zone_test.rb b/activesupport/test/core_ext/time_with_zone_test.rb
index 0f5522b7124..92c233d567f 100644
--- a/activesupport/test/core_ext/time_with_zone_test.rb
+++ b/activesupport/test/core_ext/time_with_zone_test.rb
@@ -867,13 +867,6 @@ class TimeWithZoneMethodsForTimeAndDateTimeTest < ActiveSupport::TestCase
     end
   end
 
-  def test_in_time_zone_with_dst
-    travel_to(Time.utc(2014, 5, 20, 4, 59, 59))
-    time = Time.now.in_time_zone(-4)
-    assert_equal (-4*3600), time.time_zone.utc_total_offset
-    travel_back
-  end
-
   def test_in_time_zone_with_invalid_argument
     assert_raise(ArgumentError) {  @t.in_time_zone("No such timezone exists") }
     assert_raise(ArgumentError) { @dt.in_time_zone("No such timezone exists") }